What is a User-Agent String?
A user-agent (UA) is a string that web browsers send to servers to identify themselves. It typically contains information about the browser name, version, operating system, and sometimes the device type. For example, Chrome on Windows might send: Mozilla/5.0 (Windows NT 10.0; Win64; x64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/120.0.0.0 Safari/537.36.
This tool generates random, realistic UA strings that can be used for testing, scraping, or simulating different environments – all without making any API calls.
How to Use the Generator
Step 1: Choose the device type (desktop, mobile, or all).
Step 2: Optionally filter by a specific browser (Chrome, Firefox, etc.).
Step 3: Select how many user‑agent strings you need (up to 20).
Step 4: Click "Generate" to see the list.
Step 5: Copy the generated strings with one click.
Pro Tip: Use these user‑agents in your automated tests or to see how a website renders on different devices.
Example User-Agent Strings
Chrome on Windows 11:
Mozilla/5.0 (Windows NT 10.0; Win64; x64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/121.0.6167.85 Safari/537.36
Safari on macOS:
Mozilla/5.0 (Macintosh; Intel Mac OS X 10_15_7) AppleWebKit/605.1.15 (KHTML, like Gecko) Version/17.0 Safari/605.1.15
Firefox on Android:
Mozilla/5.0 (Android 13; Mobile; rv:122.0) Gecko/122.0 Firefox/122.0
Edge on Windows 10:
Mozilla/5.0 (Windows NT 10.0; Win64; x64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/121.0.0.0 Safari/537.36 Edg/121.0.2277.83
Who Uses Random User-Agents?
- Web Developers & QA Testers: Simulate how a site behaves across different browsers and devices.
- SEO & Marketing Professionals: Check how search engines and social media crawlers see a page.
- Data Scrapers: Rotate user‑agents to avoid detection while gathering public data.
- Security Researchers: Test how applications respond to various client fingerprints.
Quick Tips
- Combine random user‑agents with proxy rotation to simulate traffic from different geographic locations.
- Use the "Desktop only" filter for testing responsive layouts on large screens.
- Remember that modern browsers often include their rendering engine (WebKit, Gecko) for compatibility.
- These UA strings are generated based on real browser releases – they are up‑to‑date and plausible.
Frequently Asked Questions
Why do browsers send a user-agent string?
Servers use the user-agent to adapt content (e.g., send a mobile version, optimise images, or enforce security rules). It also helps in analytics to see which browsers visitors use.
Are these generated user‑agents real?
Yes, they are built from common patterns of the most popular browsers and operating systems. They will work in any environment that expects a standard UA string.
Can I use these for browser fingerprinting?
While they help avoid detection based solely on UA, modern fingerprinting uses many other signals. This tool is best for testing and legitimate development, not for evading serious anti‑bot systems.
Does this tool require an internet connection?
No, everything runs locally in your browser. Once the page loads, it works offline – no API calls.